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Support for SermonSpeaker 4.x is canceled as it is for Joomla 2.5. I will gladly assist you with minor issues but I will not fix any bugs anymore in this releases.
The fix is to upgrade to SermonSpeaker 5.x and Joomla 3.x, which is better anyway.

Create a menu item pointing to the SermonSpeaker sermons list, filtered by the category you want

Select this menu item in the "Latest Sermons" module settings

On a sidenote: This menu item doesn't have to be visible on the page. You can create a whole "dummy" menu with such menu items, as long as you don't assign it to a module and publish it on the site it will not be visible. However it will be used for routing and stuff.

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Useful documentation for beginners:
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